you need the cap really or something thats gonna hold the pressure cause despite what people are saying on here trust me if you rev the engine more than a few thousand revs (ie drive it) with no cap or just a bit of tape the prssure will send a fountian of water out the tank. I know this for a fact as when i changed the coolant on my old corsa I did exacly this when running it to expell air locks etc! LOL

thats why if you were to run the engine then remove the cap as soon as you turn the engine off you get a releace of pressure and that is also why it warns you not to! LOL the warnign is also there to stop you burning yourself onthe hot air more so but u know what i mean! LOL

[Edited on 07-12-2004 by Black Corsa SRi]

James_DT

Member

Registered: 9th Apr 04
Location: Cambridgeshire
User status: Offline

7th Dec 04 at 23:38

Thought so, wasn't sure.

Yes, opening the cap on hot engine spurts hot water/steam at you. Trust me.
I'd get a cap before I drove any car missing it.

i was driving with a faulty cap which wasnt holding pressure, and cos of it it kept boiling over when i was in long queues...

the pressure created with a good cap helps raise the boiling temperature so stopping it boiling over before the fan kicks in.

new cap cost me about £12 from vauxhall - there all the same too, so dont worry if it will fit or not

there was also a noticeable difference to in running temps with the faulty cap compared to the good one, the engine runs alot cooler with a good cap!

[Edited on 08-12-2004 by PaulW]

Adam-D

Member

Registered: 11th May 02
Location: Cheshire
User status: Offline

8th Dec 04 at 09:14

i have a spare cap

Filby1

Member

Registered: 12th Dec 03
Location: Brighouse
User status: Offline

8th Dec 04 at 09:28

Gte a ne wone from Vauxhall Only 11 quid. id say worth it for a good running car

Richie

Member

Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline

8th Dec 04 at 09:32

i payed like £3 from my local auto factors for a new cap. You need it cos like it has been said, it will boil over when the car idles when hot, and u lose a shitload of water, then the engine overheats.